I LOVE this unit! First reason being I have two dogs in the house and no matter how much you clean, it still smells like a kennel, especially in the summer. The dogs bring in so much dust and sand from outside my house was looking like I never dusted or swept the floors. This has really cut down the dust.
The second reason, which I discovered by accident, is the air smells cleaner. No doggie dander smell and when I make foods which leave an odor the filter cleans them up and my house is back to smelling pure again. Bacon was the first I Discovered. I made the bacon in the morning and by early noon you couldn't tell that's what I made. Before the Whisper 510 the bacon would linger for days!
I am throughly happy with my filter! I would highly recommend it!

Lrg Room Air PurifierDonald - East Windsor Ct.

I have been running two of these Air Purifiers for two years now, works great and would recommend anyone buying one.

Long Service life on unitEd Mason - Thomaston Ct

I have been running two of these 24/7 since 2003. Other than routine filter replacements, I have not had any issues in all that time. Outstanding product.

Works great!David Carr - Orange, CA

We have been using two of these for years, one in our living room and another in our bedroom. It is amazing how much material it sucks in the prefilter alone. I would highly recommend it.